X80管线钢的成分工艺研究.pdfVIP

X80 管线钢的成分工艺研究 孔祥磊 黄国建 黄明浩 徐 烽 张英慧 （鞍钢股份技术中心，鞍山 114009 ） 摘 要 研究了不同成分及工艺对 X80 管线钢组织和性能的影响。按照不同 Cr/Mo 成分比和终轧温度设计试验， 结果表明，成分对 Rt0.5 有显著性影响，终轧温度在 790-830℃范围内对性能有非显著的影响。在Mo 和 Cr 总含量不 变条件下，随 Cr 含量增加以及 Mo 含量的降低，屈服强度显著提高，韧性略有降低。基体组织为贝氏体，均匀无 带状，晶粒细小，为 ASTM13-14 级，同时在基体上弥散分布着大量 M-A 组元。在控轧过程中析出大量细小均匀的 （Nb ，Ti ）(C，N)颗粒，可通过析出强化、细晶强化等机理有效提高钢的强度。 关键词 X80 Cr/Mo 终轧温度 性能 组织 Study on Composition and Process of X80 Pipeline Steel Kong Xianglei Huang Guojian Huang Minghao Xu Feng Zhang Yinghui (Technology Center of Angang Steel Co. , Ltd. , Anshan, 114009) Abstract The effect of different composition and process on microstructure and property of X80 pipeline steel was studied. The experiment was designed with different Cr/Mo and final rolling temperature, as the result indicates, the effect of composition on Rt0.5 is notable; the effect of final rolling temperature on property is not notable when the temperature is between 790 ℃ and 830 ℃. As the total content of Mo and Cr is fixed, yield strength increases distinctly and impact property reduces a little when the content of Cr increases and the content of Mo decreases. The microstructure is bainite, which is uniform and has no banded structure. The grain size is very fine, which is between ASTM 13 and 14. Many small M-A constituents in matrix dispersed homogeneously. A lot of fine precipitates of (Nb, Ti)(C, N) were observed in the steel, which can efficiently increase strength by the mechanism of precipitation strength, grain refinement strength and etc.. Key words X80, Cr/Mo, final rolling temperature, property, microstructure 管线运输是长距离输送石油天然气最经济合理的运输方式，为降低建设和运营成本，提高输送效率，采 用高压、大口径输送天然气已成为长距离管道建设的主流趋势，国内外已普遍将 X80